LiveWriter asks - "what blog type?". I answer "Metaweblog API" as the best guess. It returns:
http://<hostname>/<mw-script>. I don't know what to put here. Experiements all failed. I don't know what the needed XMLRPC endpoint is. I have enabled XMLRPC and Remote Blog Publishing.

One issue, my site is more than just a blog so the blog root is at mysite.com/blog, not mysite.com. That shouldn't be a problem.